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<p>I recently got the TS4 A-Os when I thought I ordered the TS A Fs
and was also worried about the possible fighting between the two
MPPT devices. As was under the gun for weather and end of year,
went with the AO's. Have you tried emailing
<a class="moz-txt-link-rfc2396E" href="mailto:support@tigoenergy.com">"support@tigoenergy.com"</a>?</p>
<p>I went through AI and found this document:</p>
<p><br>
</p>
<p><img src="cid:part1.sE2lSrli.Pig0AXXu@entech-engineering.com"
alt="" width="1497" height="842"></p>
<p><br>
</p>
<div class="moz-cite-prefix">On 11/17/2025 11:44 PM, MDElectricSolar
via RE-wrenches wrote:<br>
</div>
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cite="mid:1C18CBAD-9632-458B-A05C-100AE0449B30@gmail.com">
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We are having no issues sourcing these from our primary vendor,
Greentech.
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<div>Michael D Nelson</div>
<div>MD Electric & Solar, Inc.</div>
<div>707-684-0064 mobile</div>
<div>707-884-1862 office</div>
<div><a class="moz-txt-link-abbreviated" href="http://www.mdelectricsolar.com">www.mdelectricsolar.com</a></div>
<div><a class="moz-txt-link-abbreviated" href="http://www.facebook.com/mdelectricandsolar">www.facebook.com/mdelectricandsolar</a></div>
<br>
</div>
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<blockquote type="cite">On Nov 17, 2025, at 7:11 PM, William
Miller via RE-wrenches
<a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a> wrote:<br>
<br>
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<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Verdana","sans-serif"">Friends:</span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Verdana","sans-serif"">I
am having trouble locating these RSDs. Very few
vendors appear to have these and I can’t get any to
call back and verify they have them. I can’t get Tigo
to return my calls. Does anyone know if these are
discontinued?</span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Verdana","sans-serif"">What
are the rest of you doing for rapid shutdown? I don’t
trust Alps: I have heard too many horror stories. It
seems the form factor is too small to contain arc
suppression measures.</span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Verdana","sans-serif"">Somewhere
I saw as an alternative the Tigo TS4-A-O. These are
optimizers. I worry these will fight with the MPPT
algorithm in the inverter or charge controller. There
is also the TS4-A-S which has shutdown and monitoring.</span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Verdana","sans-serif"">All
input is welcome an appreciated. Thanks in advance.</span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Verdana","sans-serif"">William</span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif"">Miller
Solar</span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif"">17395
Oak Road, Atascadero, CA 93422</span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif"">805-438-5600</span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif""><a
href="http://www.millersolar.com/"
moz-do-not-send="true">www.millersolar.com</a></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif"">CA
Lic. 773985</span></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
</div>
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<pre class="moz-signature" cols="72">--
Christopher Warfel, PE
ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
(401) 447-5773</pre>
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